package cn.tedu.jdbc;


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;

/**
 * JDBC执行DML语句：UPDATE
 * 修改密码功能
 * 输入用户名:TONY
 *输入密码：654321
 * 结果：修改成功  |   该用户不存在
 */
public class JDBCDemo2 {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        //1,加载驱动：Class.forName("")
        Class.forName("com.mysql.cj.jdbc.Driver");
        //2,创建连接对象：
        Connection connection = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/tedu?" +
                        "characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai" +
                        "&rewriteBatchedStatements=true",
                "root",
                "123456"
        );
        //3，执行对象：connection.createStatement()
        Statement statement = connection.createStatement();
        //接受执行
        Scanner scanner = new Scanner(System.in);
        System.out.println("用户名：");
        String username = scanner.nextLine();
        System.out.println("密码：");
        String password = scanner.nextLine();
        //4，执行sql：statement.executeUpdate(sql);
        String sql = "UPDATE userinfo SET password='"+password+"' WHERE username='"+username+"'";
        int i = statement.executeUpdate(sql);
        if (i > 0) {
            System.out.println("修改成功");
        } else {
            System.out.println("该用户不存在");
        }
        //5，断开连接：connection.close();
        connection.close();
    }
}
